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| Mechanism study on the photodegradation of tylosin by pyrite and the influence of interference factors |
| Received:August 02, 2021 |
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| KeyWord:pyrite(FeS2);photodegradation;effect of N/P;effect of pH;antibiotic;tylosin |
| Author Name | Affiliation | E-mail | | KANG Xiaoyue | School of Life and Environmental Science, Guilin University of Electronic Technology, Guilin 541004, China
School of Environment and Energy, South China University of Technology, Guangzhou 510006, China | | | ZHOU Jinwen | School of Life and Environmental Science, Guilin University of Electronic Technology, Guilin 541004, China | | | LI Zhaorui | School of Life and Environmental Science, Guilin University of Electronic Technology, Guilin 541004, China | | | LI Yanpan | School of Life and Environmental Science, Guilin University of Electronic Technology, Guilin 541004, China | | | YAN Shunyi | School of Life and Environmental Science, Guilin University of Electronic Technology, Guilin 541004, China | | | SHU Xiaohua | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China | | | ZHANG Qian | School of Life and Environmental Science, Guilin University of Electronic Technology, Guilin 541004, China | qzhang0613@163.com |
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| Abstract: |
| To investigate the effect of different environmental conditions on the photocatalytic activity of pyrite(FeS2) for antibiotics and promote the photocatalytic application of FeS2, an experiment was designed to study the effects of pH, NO3-, and H2PO4- in water on the photodegradation of tylosin(TYL) by FeS2. The photocatalytic effect of FeS2 reuse was investigated, and the free radical contribution in the FeS2 photodegradation process was analyzed. Results showed that natural FeS2 could rapidly photodegrade TYL within 1 h(the degradation rate was 97%). Additionally,·OH,·O2- and h+ radicals were produced in the photocatalytic process of FeS2. The photodegradation of TYL was mainly affected by·OH and·O2-. FeS2 maintained the pH of the aqueous solution under acidic conditions, resulting in the initial solution pH having little effect on the photodegradation of TYL by pyrite. NO3- in a water environment could absorb light energy to produce·OH and promote the photodegradation of TYL. The effect of different concentrations of H2PO4- on solution pH and flocculation of Fe3+ hydrolytic colloids resulted in different effects on the photodegradation of TYL by FeS2. After FeS2 was reused four times, it maintained 80% photodegradation efficiency. Results indicate that FeS2 has potential for practical application in antibiotic photodegradation. Photodegradation efficiency is related to the pH value and concentration of NO3- and H2PO4- in wastewater. |
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